JP2601059Y2 - Shock absorber - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a structure for mounting a shock absorber, particularly a bound stopper.

[0002]

2. Description of the Related Art Conventionally, as such a shock absorber, for example, there is a shock absorber described in Japanese Utility Model Laid-Open No. 59-155342.

[0003] In this conventional shock absorber, a rod guide is provided by being fitted to the inner periphery of the upper end opening of a cylinder tube and an outer tube which are formed in two layers, and an oil seal is provided in the outer tube on the upper part. The oil seal is fitted, and is fixed by bending an upper end edge of the outer tube inward and caulking. A bound stopper is attached to the upper end opening of the outer tube. The bound stopper locks the outer peripheral portion of the stopper portion on the upper surface of the caulked portion of the outer tube, and the outer peripheral cylindrical portion is attached to the outer peripheral surface of the outer tube. It is assembled in a state where it is fitted to.

[0004]

However, in such a conventional shock absorber, as described above, the bound stopper locks the outer peripheral portion of the stopper portion on the upper surface of the caulked portion of the outer tube. Since the outer cylindrical part was assembled by simply fitting the outer cylindrical part to the outer peripheral surface of the outer tube, when a repeated impact load was input from the bumper bar to the bound stopper, the upper tube of the outer tube was crimped and bent. However, since a bending load is also input to the above, there is a problem that the strength of the swaged portion is disadvantageous.

The present invention has been made in view of the above-mentioned conventional problems, and is capable of preventing a reduction in the strength of the upper tube caulking portion of the outer tube due to a load input when the shock absorber is fully bound. The purpose is to provide a vessel.

[0006]

In order to achieve the above-mentioned object, in the shock absorber of the present invention, the inner and outer doubly formed cylinder tubes and the outer tube are fitted to the inner periphery of the upper end opening respectively. A rod guide having a different diameter is provided, and an oil seal that abuts on a piston rod and seals a hydraulic pressure is fitted on an upper portion of the rod guide at an upper end opening of the outer tube. The upper end of the tube is bent inward and caulked so that the tube is fixed between the caulked portion and the upper end surface of the cylinder tube in a state of receiving an internal residual axial force, and the opening is formed at the upper end of the outer tube. bound stopper in a state where a cover is provided in a state of being fitted to the outer peripheral cylindrical part on the outer periphery of the outer tube, the Autachi the outer circumference of the vicinity of the upper end portion of said outer tube Curved over blanking the outward substantially U-shaped cross section Rise
An extended annular rib is formed, and the lower end of the outer peripheral cylindrical portion of the bound stopper is locked to the annular rib to fix the bound stopper in the axial direction, and a predetermined amount is provided between the upper end caulking portion of the outer tube and the bound stopper. Means for forming a gap.

[0007]

According to the shock absorber of the present invention, since the shock absorber is configured as described above, when a large load is input in the axial direction during the full bounce of the shock absorber, the lower end surface of the bumper bar comes into contact with the upper surface of the bound stopper and the shock absorber. The axial load due to the collision is stopped by the projecting rib of the outer tube via the outer cylindrical portion of the bound stopper, so that the downward movement of the bound stopper is prevented. A predetermined gap is maintained between the swaged portion of the outer tube and the bound stopper.

Accordingly, it is possible to prevent a load input to the upper end caulked portion of the outer tube, thereby preventing a decrease in the strength of the upper end caulked portion of the outer tube due to the load input when the shock absorber is fully bound. In addition, due to the formation of the gap, when the shock absorber is fully bound,
Prevents direct input to the upper caulked part of the outer tube
At the same time, most of the input load in the axial direction is
So that it can be supported by the outer tube
Is obtained, that is, as described above.
The upper caulked portion of the outer tube and the
A predetermined gap is formed between the
First of all, the load input from the stopper is
To act on the outer tube.
Compress and deform the tube. On the other hand,
As a result of the compression deformation of the outer tube, the axial load
Load at this time,
Is reduced by the cushioning effect of the
As well as work on the cylinder tube via the caulked part.
Input, so that the input works in two separate ways
The buffering action and input separation action
The axial input to the tube can be made as small as possible. Obedience
The input of the axial load during full-bound
In order to prevent wear and dents of the rod guide part which comes into contact with the upper end surface of the cylinder tube, which is caused by directly receiving the cylinder position , the caulking part provides the oil seal and rod guide between the caulking part and the cylinder tube. That the applied internal residual axial force is reduced.
Can be prevented .

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. First, the configuration of the embodiment will be described. FIG. 1 is an enlarged sectional view showing a main part of the shock absorber according to the embodiment. In the drawing, reference numeral 1 denotes a cylinder tube. A reservoir chamber C is formed on the outer periphery of the cylinder tube 1 and an outer tube 2 is provided.
The rod guide 3 is provided so as to be fitted on the inner periphery of the upper end opening of the outer tube 2.

The oil seal 4 is provided above the rod guide 3. The oil seal 4 has a reinforcing ring 4a fitted on the inner periphery of the outer tube 2. The reinforcing ring 4a has a dust lip 4b and a sealing lip which are in close contact with the piston rod 5 on the inner peripheral side thereof. 4c, and a check lip 4d which is pressed against the flange 3a of the rod guide 3 is provided on the lower surface side.

The upper end of the outer tube 2 is bent inward above the oil seal 4 and caulked, and the oil seal 4 and the rod guide 3 receive an internal residual axial force by the caulked portion 2a. Fixed in state.

A bound stopper 6 is provided at the upper end of the outer tube 2. The bounce stopper 6 has an annular stopper portion 6 a for receiving a collision of a bumper bar 7 provided on an outer periphery of an upper end portion of the piston rod 5.
And an outer peripheral cylindrical portion 6b serving as a mounting portion for the outer tube 2. The outer cylindrical portion 6b is
An annular rib 6c is formed integrally with the outer peripheral portion of the annular stopper portion 6a, and is formed at an intermediate portion thereof with an inwardly projecting annular rib 6c which is in pressure contact with the outer periphery of the outer tube 2; Is formed on the outer periphery of the outer tube 2, and outwardly formed annular ribs 2b for locking the lower end of the drawn portion 6d are formed by the annular ribs 2b. A predetermined gap h is formed between the annular stopper 6a and the lower surface thereof.

Next, the operation of the embodiment will be described. When the shock absorber is fully bound, if there is a large load input in the axial direction,
As described above, the lower end surface of the bumper bar 7 comes into contact with the upper surface of the annular stopper portion 6a of the bound stopper 6, and the stroke of the shock absorber is stopped. The load is
Since the outer tube 2 is received by the outward annular ribs 2b of the outer tube 2 via the outer cylindrical portion 6b, the downward movement of the bound stopper 6 is prevented.
a and a predetermined gap h between the lower surface of the annular stopper portion 6a.
Is maintained.

Therefore, it is possible to prevent a load input to the upper caulking portion 2a of the outer tube 2, thereby preventing a decrease in the strength of the upper caulking portion 2a due to the load input when the shock absorber is fully bound.

Accordingly, it is possible to prevent a load input to the upper caulking portion 2a of the outer tube 2, thereby preventing a decrease in the strength of the upper caulking portion 2a due to a load input when the shock absorber is fully bound. Also before
Due to the formation of the clearance h, the outboard occurs when the shock absorber is fully bound.
Prevents direct input to the upper caulking portion 2a of the tube 2
Most of the axial input load is applied to the annular rib 2b.
Can be shared and supported by the outer tube 2
The effect that comes to be obtained, that is,
And the upper end caulking portion 2a of the outer tube 2
A predetermined gap h is formed with the bound stopper 6
Thus, all of the load input from the bound stopper 6
First, it acts on the outer tube 2 via the annular rib 2b.
At this time, the outer tube 2 is compressed and deformed.
You. On the other hand, the caulked portion 2a has the outer tube 2
As a result of the compressive deformation, an axial load is applied.
Therefore, the load at this time causes the outer tube 2 to be compressed and deformed.
And the buffering effect of
It also acts on the cylinder tube 1 via the interference portion 2a.
Therefore, the input will act in two separate ways,
This cushioning action and input separation action make the cylinder tube
The axial input to the valve 1 can be made as small as possible. Therefore,
Input the axial load at full bound to the cylinder tube 1
Since the wear and the dent of the portion of the rod guide 3 which comes into contact with the upper end surface of the cylinder tube 1 caused by being directly received at the position are prevented, the oil seal 4 is provided between the caulked portion 2a and the cylinder tube 1 by the caulked portion 2a. and it is possible to prevent the internal residual axial force applied to the rod guide 3 is <br/> reduced.

Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and even if there is a design change or the like without departing from the gist of the present invention. Included in the present invention.

For example, in the embodiment, the projecting rib is formed in an annular shape over the entire outer periphery of the outer tube, but may be formed in a spot-like manner.

Further, in the above embodiment, a double-cylinder type shock absorber is taken as an example. However, in a single-tube type shock absorber, steps are provided on the outer periphery and the inner periphery of the upper end opening of the tube, and the inner peripheral steps are provided. The oil seal is fitted on the rod guide and the upper part thereof, and the oil seal and the rod guide are fixed by bending the upper edge of the tube inward and crimping. Next, a predetermined gap is formed between the upper end caulked portion of the tube and the bound stopper by engaging the lower end of the outer peripheral cylindrical portion of the bound stopper at the step on the outer periphery of the upper end opening of the tube. Thus, the present invention is applicable to a single cylinder type shock absorber.

[0019]

As has been described above invention], in the damper of the present invention, the Au on the outer circumference of the vicinity of the upper end portion of the outer tube
An annular shape in which the tube is bent outwardly in a U-shaped cross section.
By forming a rib and locking the lower end of the outer peripheral cylindrical portion of the bound stopper to the annular rib , a predetermined gap is formed between the upper end caulking portion of the outer tube and the bound stopper. An effect is obtained that the strength of the upper end caulked portion of the outer tube can be prevented from lowering due to the load input during the bounce. In addition, due to the formation of the gap, when the shock absorber is fully bound,
Prevents direct input to the upper caulked part of the outer tube
At the same time, most of the input load in the axial direction is
So that it can be supported by the outer tube
Is obtained, that is, as described above.
The upper caulked portion of the outer tube and the
A predetermined gap is formed between the
First of all, the load input from the stopper is
To act on the outer tube.
Compress and deform the tube. On the other hand,
As a result of the compression deformation of the outer tube, the axial load
Load at this time,
Is reduced by the cushioning effect of the
As well as work on the cylinder tube via the caulked part.
Input, so that the input works in two separate ways
The buffering action and input separation action
The axial input to the tube can be made as small as possible. Obedience
The input of the axial load during full-bound
In order to prevent wear and dents of the rod guide part which comes into contact with the upper end surface of the cylinder tube, which is caused by directly receiving the cylinder position , the caulking part provides the oil seal and rod guide between the caulking part and the cylinder tube. the Rukoto granted internal residual axial force to reduce
The effect that it becomes possible to prevent is obtained.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view showing a main part of a shock absorber according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder tube 2 Outer tube 2a Caulking part 2b Annular rib (projecting rib) 3 Rod guide 4 Oil seal 5 Piston rod 6 Bound stopper 6b Outer cylinder part h Gap

Claims (1)

(57) [Scope of request for utility model registration] 1. A rod guide having a different diameter is provided by being fitted to the inner periphery of an upper end opening of a cylinder tube and an outer tube which are formed double inside and outside, and a rod guide having a different diameter is provided at the upper end opening of the outer tube. Is fitted with an oil seal that abuts on the piston rod to seal the hydraulic pressure, and the oil seal and the rod guide bend the upper end of the outer tube inward to caulk the caulked portion and the cylinder tube. A state in which the outer cylindrical portion is fitted on the outer periphery of the outer tube with a bound stopper fixed to the upper end surface of the outer tube while receiving an internal residual axial force and covering the opening at the upper end of the outer tube. provided by, the Autachu the outer circumference of the vicinity of the upper end portion of said outer tube
Forming an annular rib which is formed by curving and bulging outwardly in a substantially U-shaped cross section, and locking the lower end of the outer peripheral cylindrical portion of the bound stopper to the annular rib to fix the bound stopper in the axial direction. A shock absorber characterized in that a predetermined gap is formed between an upper end caulked portion of a tube and a bound stopper.